How to Resize an Image Without Photoshop (Free & Online)

For ID / Passport Photos

Many forms require **35×45mm at 300 DPI** — that equals **413×531 pixels**. Use exact pixel dimensions in our resize tool.

Do I Lose Quality When Resizing?

**Downscaling** (making smaller) doesn't lose quality — you're removing excess pixels. The image will look identical at its new, smaller size.

**Upscaling** (making larger) does reduce quality — you're adding pixels that don't exist. For upscaling, use our [Image Upscaler](/image-upscaler) which uses AI to add realistic detail.

FAQ

Can I resize without changing the proportions?

Yes — enable "Lock Aspect Ratio" in our tool. Enter just the width, and the height calculates automatically.

What's the difference between resizing and cropping?

Resizing changes the total pixel dimensions while keeping the whole image. Cropping cuts away part of the image.

Will resizing reduce the file size?

Yes — significantly. A 4000×3000 image resized to 1200×900 will be approximately 11x smaller in file size.